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Medium 1 Mark

English Conditional Sentences

Choose the correct sentence.

A If metal is heated, it will expand.

B If metal is heated, it expands.

C If metal heats, it will expanding.

D If metal is heated, it expanded.

Describing a scientific fact (heated metal always expands) requires present simple in both clauses, not "will."

Reference: Skoolyst English Grammar Guide , Page 1

Scientific facts and natural laws are classic zero conditional territory.